I would say if you're going to sell that GameCube RGB cable, do it soon. A GameCube HDMI output box was briefly available last year and although it was taken off the market (it contained a defect that could fry people's machines) the creator is working on a better one, and other people are bound to offer a similar product within the next 12 months. The jump in visual clarity it offered was fantastic.

The value of a GameCube RGB cable could plummet if those things are readily available.

Got a modded US SNES (Super CIC + component out at the back) from SpeedLolita or Marmotta some time ago. How much is this worth? Think I paid something like £100 and I'm just looking to off-load it since I got a Super Nt.

Same with an AV Famicom - How much is this worth? (Console only + controller)